The Lemonade War Chapter 3

Alright Mathematicians
I was on Pinterest and found plans for this lemonade stand, but I want to paint the front using chalkboard paint.
The paint can says it covers only so many square inches. In fact, it only covers 120 square inches per can.
The front of my stand is 4 feet by 5 ft. How many square inches is the front of the stand and how many cans of paint will I need?